Electric incandescent lamp for performing signals or flash light



Nov. 24, 1925.

K. G. LKSSEL ELECTRIC INCANDESGENT LAMP FOR PERFORMING SIGNALS OR FLASH LIGHT Filed Aug. 15. 1924 Patented Nov. 24, 1925.

UNITED STATES KARL GUSTAV LISSEL, OF STOGKHOLM, SWEDEN, ASSIGNOB TO SVENSKA ACKUMU- LATOR AKTIEBOLAGET JUNGNER, 0F

ELECTRIC INCANDESCENT LAMP FOR PERFORMING Application filed August To all whom it may concern.

Be it known that I, KARL GUSTAV LrssnL, a subject of the King of Sweden, residing at Vegagatan 14:, Stockholm, Sweden, have invented certain new and useful Improvements in Electric Incandescent Lamps for Performing Signals or Flash Light (for which I have filed application in Sweden on November 18, 1922, and in Germany on Way 01, 1923), of which the following is a specification.

For the purpose of performing light signals or flash-light several difl erent means have been used, which are, however, often rather complicated or unnecessarily large and slow-acting.

This invention has for its object to avoid said drawbacks and, besides, to obtain in certain cases a sharp cutting off of the light, which is desirable particularly in signaling and also in flash-light lamps for advertising purposes. In such case it is, besides, desir able to avoid the drawback that the filament of the incandescent lamp does not immediately go out or is not immediately lighted, but is gradually brought to go out or to be lighted.

The invention contemplates such means in electric incandescent lamps, in which the signals are performed by means of a screen located within the lamp bulb and movable over the filament, and consists in'this that said lamp bulb is provided with an extension containing a magnetic armature displacing the screen and which may be acted on by a magnet or a solenoid located outside the bulb.

In the annexed drawing, showing one form of embodiment of a device according to theinvention, 1 designates a lamp bulb containing the filament 2 a screen 3 and a magnet core 4 carrying the screen 3, the winding 5 of said magnet being arranged outside the extended portion of the lamp bulb, in which the core 4 moves.

If the filament of the lamp glows continuously, a flash-light or signals may be per formed by closing and breaking the current to the winding 5, whereby the core 4: is raised and lowered and moves the screen 3 away from the filament or in front of it. The screen may, if desired, be formed as a cap, so that the light will be still more covered. When breaking the current to the winding 5, the core will drop due to its PATENT OFFICE,

STOCKHOLM, SWEDEN, A CORPORATION.

SIGNALS OR FLASH LIGHT.

15, 1924. Serial No. 732,302.

gravity. The said dropping movement may be assisted by a spring so as to be performed faster. If the core would obtain a horizontal position instead of the vertical position shown, the movement of the screen may be performed either in such manner that a magnet winding moves the core and, thus, the screen in the one direction and a spring in the other direction or a winding may be arranged for each direction bf move ment, the current being closed for one of said windingsand simultaneously broken for said second winding and vice versa.

The elongated or extended portion of the bulb is, preferably, made cylindrical, and the screen may be rigidly secured to and movable with the core. The movements of said core may be limited by suitable arrest.- ing means provided within the extended portion. I

The device may also be used for performing signals having differently coloured light, for instance by colouring certain parts of the screen differently and imparting a step by step motion to the screen, or by the provision of several differently coloured screens, which are moved alternately in front of the light. The screen may also be ,rinade wholly opaque or translucent to some degree in order to blind the light. The cupshaped screen may, preferably, be open at the top, as shown in the drawing, for ventilation purposes.

What I claim as new and desire to secure by Letters Patent of the United States of America is 1. In an incandescent lamp, the combination of an extension of the lamp bulb, a magnetic armature movable within said extension and capable of being acted on by a magnet or solenoid located outside the lamp bulb, means for limiting the movement of said armature, and a screen connected to said armature and having a substantially cylindrical shape, said screen being movable in its axial direction so as to enclose and disclose the filament, respectively.

2. In an incandescent lamp, the combination of an extension of the lamp bulb, a magnetic armature movable within said extension and capable of being acted on by a magnet or solenoid located outside the lamp bulb, means for limiting the movement of said armature, and a screen connected to said armature, said screen being cup-shaped and movable in its axial direction, so as to lamp bulb, means for limiting the movement enclose and disclose the filament, respectiveof said armature, and a screen connected to 10 1y, I said armature, said screen being cup-shaped 3. In an incandescent lamp, the eombina and open also at the top and movable in its 5 tion of an extension of the lamp bulb, a axial direction, so as to enclose and disclose magnetic armature movable Within said exthe filamffllt, esp ct ve ytension and capabl of bei act d on b In testlmony whereof I affix my signature. amagnet or solenoid located outside the KARL GUSTAV LISSEL. 

